A mobile network refresh will update and confirm with the SIM the correct profile information. For example, the products and services used on the network.
This is can often resolve a connectivity issue where a SIM is 'stuck' in a session or is not responding correctly.
However, if this method of restoring connectivity persists it is best practice to seek advise from your device manufacturer to establish a root cause.
You can find an article on how to refresh SIMs here.